In the challenging world of underground construction, particularly in water-rich fractured strata, engineers face significant hurdles that can impact project timelines and budgets. A recent study published in the *Journal of Highway and Transportation Research and Development* (translated from Chinese as *Journal of Highway and Transportation Engineering*) sheds new light on these challenges, offering a promising approach to predict and manage frictional resistance in rock pipe jacking projects. The research, led by Chao Zhang of Guangdong Yuehai Yuedong Water Supply Co., Ltd., provides valuable insights that could revolutionize construction practices in the energy sector and beyond.
Rock pipe jacking involves the installation of underground pipelines by jacking sections through the ground, a technique often employed in water supply, sewage, and energy infrastructure projects. However, when dealing with water-rich fractured strata, the surrounding rock can become significantly disturbed, leading to unpredictable mechanical properties and frictional resistance. This uncertainty can result in construction delays, increased costs, and potential project failures.
Zhang and his team addressed these issues by combining model testing, theoretical analysis, and practical engineering experience. Their study focused on understanding the variation patterns of surrounding rock pressure and displacement across different rock classes influenced by groundwater. “We found that lower surrounding rock classes experience more pronounced displacement variations and stress release, with groundwater further amplifying these effects,” Zhang explained. This finding underscores the importance of considering rock class and groundwater conditions in construction planning.
One of the study’s key contributions is the development of a simplified mechanical model to represent the pipe–slurry–residue contact frictional resistance. This model was validated using both model test results and engineering measurements, demonstrating a strong agreement with an average error of just 9.42% in unit frictional resistance. “The theoretical and model test values showed consistent trends in frictional resistance variation,” Zhang noted, highlighting the model’s reliability.
The study also revealed that the unit frictional resistance increases linearly with the groundwater correction factor, distance from the groundwater level to the pipe, and friction angle between the pipe and residue zone. Conversely, it decreases with the elastic modulus, following a power function relationship. These findings provide a robust foundation for predicting frictional resistance in rock pipe jacking projects, enabling engineers to optimize construction processes and minimize risks.
The commercial implications of this research are substantial, particularly for the energy sector, where underground infrastructure is crucial for transporting oil, gas, and other resources. By offering a reliable method for predicting frictional resistance, this study can help energy companies reduce construction costs, improve project efficiency, and enhance the safety of their underground infrastructure.
Looking ahead, the findings from this study could shape future developments in the field of underground construction. As Chao Zhang and his team continue to refine their model and gather more data, the industry can expect even more accurate predictions and optimized construction techniques. This research not only addresses current challenges but also paves the way for innovative solutions that will benefit the energy sector and other industries relying on underground infrastructure.
In conclusion, the study published in the *Journal of Highway and Transportation Research and Development* represents a significant advancement in the field of rock pipe jacking. By providing a reliable model for predicting frictional resistance, Chao Zhang and his team have offered a valuable tool for engineers and construction professionals. As the energy sector continues to evolve, this research will play a crucial role in shaping the future of underground construction, ensuring safer, more efficient, and cost-effective projects.